Lerie



(No Model.)

S. LAGAVALERIE & O. DORIOT.

DENTAL'PLUGGBR.

Patented Aug. 13, 1889.

6? Jam. 6. 49M

WIT NEEEEEI INVENTEH IS:

N: PETERS. Phoqo um m her. Washington. \10.

' UNITED STATES PATENT OFFICE.

SEBASTIEN LACAVALERIE AND CONSTANT DORIOT, OF PHILADELPHIA PENNSYLVANIA,ASSIGNORS TO THE S. S. IVHITE DENTAL MANUFAC- TURING COMPANY, OF SAMEPLACE.

DENTAL PLUGGER.

SPECIFICATION forming part of Letters Patent No. 408,883, dated August13, 1889. Application filed February 1, 1387- Serial No. 226.159. (Nomodel.)

To all whom it may concern.-

Be it known that we, SEBASTIEN LAoAvA- LERIE and CONSTANT DORIOT,citizens of the Republic of France, residin at Philadelphia,

in the county of Philadelphia and State of Pennsylvania, have inventedcertain new and useful Improvements in Dental Pluggers, of which thefollowing is a specification.

Our invention relates to improvements ap- IO plicable to dental pluggcrsadapted to be operated by means of a rotary driving-shaft, to whichmotion may be imparted from any suitable motor.

Our object mainlyisto provide novel means 1 5 for operating the plugger,whereby it may be actuated by rotation of the driving-shaft in eitherdirection; and to this end our invention consists in the employment, inconnection with a rotary spindle and appropriate appur- 2o tenancesthereof, of a pair of concentricallyarranged cams having reVersely-cutor oppositely-inclined faces and adapted to operate alternately,according to the direction of rotation of the spindle, to effect thedelivery of blows upon the plugging-tool.

Our invention further consists in certain novel means for preventingblows being imparted to the plugging-tool.

In the accompanying drawings, which show 0 a suitable embodiment of ourimprovements in a dental plugger, Figure 1 isaview,partly in elevationand partly in longitudinal central section, of the complete plugger;Fig. 2, a view in elevation of a portion thereof; and

3 5 Fig. 3, a bottom end view or inverted plan, on

' an enlarged scale, of the spindle and concentrically-arranged cams.

The hand-piece or cylindrical casing A of the instrument has removablyconnected to 40 its outer end the tapering sleeve B, provided with thedetachable supplementary bearingsleeve or nose-piece B for a suitablespringretracted clutch or holder of the pluggingtool a. The inner orbutt end of the casing A 5 is internally threaded to receive theexternally-threaded sleeve d, in which, as well as in a plug d, thehammer shank or spindle c has bearing. The plug d is adj ustablelengthwise of the spindle e, for a purpose to be farther on explained.The projecting portion 6 of the spindle may be of any desired form ordimensions to adaptit to be connected with and rotated by any of theordinary dental engines.

Upon the spindle is loosely and concentrically fitted a tube or sleeve9, having its outer end formed or cut away spirally to produce a camface or incline g, terminating in a shoulder g to abut against a pin orstud g fixed to and projecting laterally from the spindle. A tube H, oflarger diameter than the tube 9 and loosely encircling it, has one ormore spiral inclines or cam-faces 71/ formed or cut 011 its outer endconcentrically with theinner cam face or incline g. In this instance,and for a purpose hereinafter explained, there are two outercam-inclines terminating, like the inner cam-incline, in shoulders, 7bto abut against a fixed pin or stud h on the inner ca1n-tube g. Theconcentric camfaces g and h are cut reverselythat is, formed to inclinein opposite directions.

Between the inner end of the outer camtube II and the plug d is arrangeda spiral spring H, acting to press the tubes outward or in a directionaway from said plug. This spring acts upon a hammer to produce the blowsupon the plugging-tool in manner presently to be made apparent.

The cam-tube H is threaded and screwed 8c into a hammer-tube I. Thehammer-head is normally in contact with the inner end of theplugging-tool holder. The casing A is slotted at k to form a guideway,in which plays a pin or set-screw 7e, secured to the hammer. Thereciprocation of the hammer is in this way allowed, while its rotationin the casing is prevented.

From the above description it will be seen that when the spindle isrotated, as by conneetion with. the flexible shaft of a dental engine,the hammer will be operated, regardless of the direction of rotation ofthe spindle, to impart blows to the plugging-tool. WVhen the spindle isturn edsay to the right 9 5 the spindle-stud g first acts against thecam g, forcing its tube back, thus compressing the spring H and liftingor retracting the hammer. N6Xt,Wl1011il10 spindlestud reaches thecam-shoulder, the cam-tube is released and the hammer is projectedforward by the spring to deliver its blow. \Vhen the spindle is turnedin the opposite direction, the stud lfiof the inner cam-tube g ispresented in turn to the cam face or faces and the shoulder or shouldersof the outer cam-tube, the hammer being forced forward at rapidintervals by the action of the spring, as above explained. By theemployment of the two concentricallyarranged cams or cam-ended tubes, weprovide not only for operating the tool by the retation of the spindlein either direction, but are enabled to change the rapidity with which.the blows are delivered by providing one of the cam-tubes with duplicatecams.

In order to avoid the disagreeable eilects and sensations produced bythe impact of one hard metal upon the other, we provide the hammer witha head consisting of a block of rubber, celluloid, wood, vulcanizedfiber, or other material, which will partly cushion the blow and preventthe plugging-tool from operating with too much violence.

To prevent the plugging-tool from operating when it is desired to use itfor picking up gold, &e., a slotted slide M, having a fingerpiece M, isattached, as shown,to the outside of the case near its lower end. Thisslide, when drawn up, acts upon the stud or set screw 70, projectingfrom the hammer, and prevents the hammer from striking the plugging-tool without interfering with the rotation of the shaft. \Vhen theslide is moved down, the slot therein for the stud 70 allows the hammerto reciprocate freely. By adjusting the A knob or pin in projects fromthe side of the cap or plug (1 into an oblique or spiral slot in in thewall of the ease A,so that by moving said plug in a rotary direction itwill be raised or lowered. The slot m is graduated, the figures 1, 2, 3,&e., indicating the degree of pressure and force of the blow.

\Ve claim as our inventiou 1. The combination of the casing, the retaryspindle, a reciprocating hammer, its actuatings ning, and thereversely-inclined eoncentric cams upon the spindle, substantially asand for the purpose set forth.

2. The combination of the casing, the retary spindle, a reciprocatinghammer, its actuating-spring, and the concentric cam-ended tubes uponthe spindle, the one tube being provided. with a single cam and theother with duplicate cams inclined reversely to said single cam,substantially as and for the purpose set forth.

The combination of the casing, the reciprocating hammer, the springacting to project the hammer, the slotted slide on the easing, providedwith the linger-piece, and the stud fixed to the hammer, projectingthrough slots in the casing and slide and acted upon by the slide toprevent movement of thehaminer by its spring, substantially as and forthe purpose set forth.

In testimony that we claim the foregoing we have hereunto set our handsthis 28th day of January, A. l). lSST.

SEBASTIEN LACAVALERIE. (TONSTAN'J DORIOT.

lVitnesses:

'liios. A. COXNOLLY, R. l).\ LE SPARHAWK.

